It's no surprise that one individual cannot monitor every flight that departs or arrives in Oz.
However, amazingly, BA16, which I recall pre-COVID as almost never late from a reasonably large sample, is again tardy on Tuesday 20 December, with B773ER G-STBJ not airborne until 1903 hours on this 1630 hours scheduled pushback affair. SIN arrival should be 2345 hours, 135 minutes tardy.
BA15 is constantly departing London Heathrow late, probably due to the arctic-like conditions the UK has had some days, and it all seems to snowball from there. I assume mandatory crew rest times contribute at times, although one would expect that pilots and cabin crews alike would have a layover in Oz of at least 1.5 days (i.e. not going back on the next day's flight) and probably similar in Singapore.
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In late September to early October 2022, I was in the UK, including London some days, and by and large the weather was sunny, and benign: how 10 weeks makes a difference!